Tunnelling - Section 1 (5)

Directions to Solve

Tunnelling - Section 1

The questions related to tunneling is available in the form of MCQs and in this
section you will find all the important questions.

33.

The most commonly adopted pattern of cut holes is :

A.	horizontal wedge cut
B.	pyramid cut
C.	fan cut
D.	V-cut
E.	All the above.

Answer: Option E

Explanation:

No answer description available for this question. Let us discuss.

34.

To attain the required shape of the tunnel section, we use :

A.	easers
B.	trimmers
C.	cut holes
D.	chisels.

Answer: Option B

Explanation:

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35.

Pick up the correct statement from the following during tunnel excavation,

A.	Oxygen should not be less than 19.5%
B.	Carbondioxide should not be more than 0.5%
C.	Hydrogen sulphide should not be more than 0.001%
D.	Carbon mono-oxide should not be more than 0.01%
E.	All of the above.

Answer: Option E

Explanation:

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36.

The method of draining in the tunnels, is generally known as

A.	foredrainage
B.	dewatering
C.	permanent drainage
D.	All of the above.

Answer: Option D

Explanation:

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37.

For tunnels exceeding 300 m in length, the grade should be provided below

A.	50% of the ruling gradient
B.	60% of the ruling gradient
C.	75% of the ruling gradient
D.	80% of the ruling gradient.

Answer: Option C

Explanation:

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38.

Pick up the correct statement regarding drilling a tunnel from the following:

A.	Holes are drilled by pneumatically operated rock drills
B.	One drill is required for each 4 to 5 m2 force area
C.	The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
D.	All of the above.

Answer: Option D

Explanation:

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39.

For B.G. single track railway, the height of the tunnel above top of rails should be

A.	5.5 m to 5.8 m
B.	5.8 m to 6.2 m
C.	6.7 m to 7.3 m
D.	7.3 m to 7.5 m

Answer: Option C

Explanation:

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40.

A tunnel is found more advantageous as compared to the alternate routes because it:

A.	remains free from snow
B.	reduces the cost by reducing the route distance
C.	reduces the maintenance cost
D.	avoids interference with surface rights
E.	All the above.

Answer: Option E

Explanation:

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